Hello,
Again with you :D Researched and decide on Roland. I have few money. Want to buy td-4 or td-3 kw. Which module is good? How many more cymbal can I add? Please tell me ''+'' and ''-'' for the modules. Thank you for your help.

I had a TD-3 and it's good to start with. I don't think there's much difference between the two. The TD-4 only has 11 more sounds. But the TD-4 did replace the TD-3. It also depends how much you want to spend. If you want to spend more and get the TD-4 with all mesh pads, then that will be nicer than the TD-3. But if you're not wanting to spend that much and are just planning on getting rubber pads for the toms, I think you'd be fine with a TD-3.